<!DOCTYPE html>
<html>
<head>
  <script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
  <meta charset="utf-8">
  <title>Konva Ring Demo</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-color: #F0F0F0;
    }
  </style>
</head>
<body>
  <div id="container"></div>
  <script>
    var width = window.innerWidth;
    var height = window.innerHeight;

    var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height
    });

    var layer = new Konva.Layer();

    var ring = new Konva.Ring({
      x: stage.getWidth() / 2,
      y: stage.getHeight() / 2,
      innerRadius: 40,
      outerRadius: 70,
      fill: 'yellow',
      stroke: 'black',
      strokeWidth: 4
    });

    // add the shape to the layer
    layer.add(ring);

    // add the layer to the stage
    stage.add(layer);
  </script>

</body>
</html>
